BlackPixelOfScreen(3)


NAME

   BlackPixelOfScreen, WhitePixelOfScreen, CellsOfScreen,
   DefaultColormapOfScreen, DefaultDepthOfScreen, DefaultGCOfScreen,
   DefaultVisualOfScreen, DoesBackingStore, DoesSaveUnders,
   DisplayOfScreen, XScreenNumberOfScreen, EventMaskOfScreen,
   HeightOfScreen, HeightMMOfScreen, MaxCmapsOfScreen, MinCmapsOfScreen,
   PlanesOfScreen, RootWindowOfScreen, WidthOfScreen, WidthMMOfScreen -
   screen information functions and macros

SYNTAX

   unsigned long BlackPixelOfScreen(Screen *screen);

   unsigned long WhitePixelOfScreen(Screen *screen);

   int CellsOfScreen(Screen *screen);

   Colormap DefaultColormapOfScreen(Screen *screen);

   int DefaultDepthOfScreen(Screen *screen);

   GC DefaultGCOfScreen(Screen *screen);

   Visual *DefaultVisualOfScreen(Screen *screen);

   int DoesBackingStore(Screen *screen);

   Bool DoesSaveUnders(Screen *screen);

   Display *DisplayOfScreen(Screen *screen);

   int XScreenNumberOfScreen(Screen *screen);

   long EventMaskOfScreen(Screen *screen);

   int HeightOfScreen(Screen *screen);

   int HeightMMOfScreen(Screen *screen);

   int MaxCmapsOfScreen(Screen *screen);

   int MinCmapsOfScreen(Screen *screen);

   int PlanesOfScreen(Screen *screen);

   Window RootWindowOfScreen(Screen *screen);

   int WidthOfScreen(Screen *screen);

   int WidthMMOfScreen(Screen *screen);

ARGUMENTS

   screen    Specifies the appropriate Screen structure.

DESCRIPTION

   The BlackPixelOfScreen macro returns the black pixel value of the
   specified screen.

   The WhitePixelOfScreen macro returns the white pixel value of the
   specified screen.

   The CellsOfScreen macro returns the number of colormap cells in the
   default colormap of the specified screen.

   The DefaultColormapOfScreen macro returns the default colormap of the
   specified screen.

   The DefaultDepthOfScreen macro returns the default depth of the root
   window of the specified screen.

   The DefaultGCOfScreen macro returns the default GC of the specified
   screen, which has the same depth as the root window of the screen.

   The DefaultVisualOfScreen macro returns the default visual of the
   specified screen.

   The DoesBackingStore macro returns WhenMapped, NotUseful, or Always,
   which indicate whether the screen supports backing stores.

   The DoesSaveUnders macro returns a Boolean value indicating whether the
   screen supports save unders.

   The DisplayOfScreen macro returns the display of the specified screen.

   The XScreenNumberOfScreen function returns the screen index number of
   the specified screen.

   The EventMaskOfScreen macro returns the root event mask of the root
   window for the specified screen at connection setup.

   The HeightOfScreen macro returns the height of the specified screen.

   The HeightMMOfScreen macro returns the height of the specified screen
   in millimeters.

   The MaxCmapsOfScreen macro returns the maximum number of installed
   colormaps supported by the specified screen.

   The MinCmapsOfScreen macro returns the minimum number of installed
   colormaps supported by the specified screen.

   The PlanesOfScreen macro returns the number of planes in the root
   window of the specified screen.

   The RootWindowOfScreen macro returns the root window of the specified
   screen.

   The WidthOfScreen macro returns the width of the specified screen.

   The WidthMMOfScreen macro returns the width of the specified screen in
   millimeters.

SEE ALSO

   AllPlanes(3), ImageByteOrder(3), IsCursorKey(3)
   Xlib - C Language X Interface





Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.





Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.


Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.





Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.


Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.





Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.


Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.